A protester was shot in Portland amid a rowdy standoff with police as a fourth night of protests unfolded around the nation, spurred by outrage over the election of Donald Trump as president.

The non-fatal shooting occurred when a protester on the Morrison Bridge was shot by an unidentified man who was part of a group of people attempting to cross the bridge in a car.

“Preliminary information indicates that a suspect was in a vehicle on the bridge and there was a confrontation with someone in the protest. The suspect got out of the vehicle and fired multiple shots injuring the victim,” the Portland Police Bureau said in a statement.

It said the suspect, an African American male who appeared to be in his late teens, escaped the scene.

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The altercation came as Portland police elsewhere were driving back surging protesters with dozens of flash-bang grenades and high-pitched whistles. Authorities said crowds spray-painted graffiti and at one point hurled “burning projectiles” at police.

Cameron Whitten, a Portland community advocate, told the Oregonian newspaper that the shooting incident began as a verbal confrontation between marching protesters and several occupants of a car attempting to drive the other way.

He said several people got out of the car and one person fired into the air, then shot the demonstrator.

Most of the other protests across the country unfolded relatively peacefully; demonstrators carried signs that read “Love Trumps Hate” and chanted, “He’s not my president!”

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An estimated 3,000 protesters marched from City Hall to the Westlake neighborhood in downtown Los Angeles. About 150 of them were arrested near Grand Park early Saturday morning after refusing the LAPD’s order to disperse.

In addition to the protests in Los Angeles, demonstrators marched in Orlando, Fla.; Portland, Ore.; New York; Chicago; Boston and Atlanta, among other cities. For the most part, the crowds were smaller and the marches smaller than in previous days, officials said.

A crowd outside the president-elect’s residence at Trump Tower on 5th Avenue in New York was contained by police and concrete barriers in a staging area, while hundreds of people attended a “love rally” less than three miles away in Washington Square Park.

In Atlanta, protesters marched peacefully, as was the case elsewhere. Several thousand people gathered on Boston Common to object to the election of Trump.

Leslie Holmes, 65, a website developer from Wilton, Conn., took an hourlong train ride to the Boston demonstration. She described herself as an armchair liberal but declared, “I’m not going to be armchair anymore.”

Protesters briefly faced off with Trump supporters who crashed the Florida rally. “Trump is our president! You need to [expletive] remember that!” a supporter shouted at protesters. His sign was snatched away, and the crowd chanted, “You’re a deplorable!”

Portland had seen earlier unrest on Thursday, when a group of anarchists began smashing shop windows and lighting a dumpster fire, causing an estimated $1 million in damage.

Portland Police Chief Mike Marshman had asked peaceful protesters to take the night off so police could focus on the violent demonstrators if they showed up again. But the activists took to the streets again and became locked in a standoff with police, chanting, “Let us march.”

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Portland’s Resistance spokesman Gregory McKelvey, a 23-year-old law student, said the city can expect protests through the weekend. The group announced Friday it had launched a GoFundMe page to help pay for the damage caused by the violent protests.

Anderson is a special correspondent. The Associated Press and Orlando Sentinel contributed to this report.